F1 screen COLORIZE DMD (unchecked) doesn't hold Monochromactic colors

[BLawicki]

Tested on various tables. (Who Dunnit currently used for testing) Standard color pallete is used. Open F1 change first color to greyish brown, uncheck Colorize DMD. Exit VPinmame. Retest and only holding standard DMD colorization. The monochromatic colors can be set with the Colorize DMD option set and they hold. Unchecked is not working outside of default.

VPinMame 3.6.0.998 initially noticed in 996 hence the upgrade.